burnett



' shaft, and assuming l head.

ifgatwt fitr.

B. J. BURNETT,V OF MOUNT VERNON, NEW YORK. Leners Patent No. 86,809, deze@ Febwary- 9, 1869.

IJMIPROVEMENT IN VENTJIITORS.

To all whom it ma/y concern Be it known that I, B. J. BURNETT, of Mount Vernon, in the county of Westchester, and State of New York, have invented a certain new and useful Improvement in 'Ventilators, which I denominate The Gen` tripetal Ventilator5 and Ido hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, formingpart of this specication, and in which- Figure l represents a vertical section of my improved ventilator,

Figure 2, a horizontal section of the same, taken as denoted by the line :t x in iig. l; and

Figure 3, a similar view through the line z z.

l ,Similar letters of reference indicate corresponding parts.

`Iu this, my improvement, which I vdenominate a centripetal ventilator, power is so concentrated and directed, as that a current of pure atmospheric air is, as it were, injected down and through-a centre airshaft, which action is made constant by the accumulated pressure of air on the Windward side, obtained by deectors in'the head of the ventilator. u The pure, cool air, in thus passing down a centre place the vitiated air below, and force itup a shaft its proper position, tends to dis-` outside ofthe centre one, the force ofthe draught cre-' ated by the outside current on the leeward side of the head, aiding such action, and being communicated to the area between such fresh and foulair shafts, by conical deectors in the head.

' To this end, or these ends, the invention includes a combination of short upper-air shafts, of a suitable length, proportioned to the diameter of the ventilator, all terminating in theon'e inside or centre air-shaft;

also, a'series. of deectors, of conical character, di vided.

into segments, arranged around the outside diameter of the group of upp'er air-shafts; likewise, in combinar tion with the inside air-shaft, anV outside draught-case and flap-valves in the throat of each upper air-shaft, operated by wires or rods from below.

Referring to the accompanying drawing- A represents the centre air-shaft, down which pure atmospheric air passes to the apartment or chamber to be ventilated.

This shaft is in communication with any desired number of slort separate upper air-shafts, B, extend- `ing up to the head, C, of the ventilator, and termina- D, open to the atmosphere, under said ting in throats,

The fronts or outsides of these separate upper airshafts, for a certain distance from their tops below the throats, are of an open character, and provided or fitted with a series of what may be termed conical segmental deflectors, E, the same being arranged, it may be said,

in tiers, around the outside diameter of the group -of upper air-shafts.

Flap-valves, E, operated by Wires or rods, Gr, from below, are fitted in the throat of each upper air-shaft.

HV is a draught-case or shaft, arranged to surround* the centre air-shaft A, and extended and enlarged E as to surround, also, as far as the, bottoms of their throats, (where it may he made to lap inward,) the upper air-shafts B.

From this description it will be seen that the pure atmospheric air, which enters by the throats D'that lie on the Windward side'of theventilator, is projected down the upper air-shafts B, with which said throats are in communication, and down the centre `air-shaft A, said current or currents being restrained bythe detlectors E from passing into the upper portion or extension of the draughtcase or shaft H, while the foul air, escaping up the latter shaft or case, naturally takes the course-which conducts to the leeward side 'of the ventilator, and, in so doing, has to pass through hetween the deectors E, which lie or are arranged on said side, and out through their upper air-shafts.

This produces a sort of eddy in the leeward upper air-shafts B, which, without impeding the escape of the vitiated air, operates to prevent any upward -current through the shaft A.V The iiapvalves F, arranged as shown aud described, serve to direct and control the current and draught through each or all of the upper air-shafts B, on the4 Windward and leeward sides of the ventilator, and, being separately manageable from below, admit of the most perfect control.

.What is here claimed, and desired to be secured by' l. The combination, with acentre or common airshaft, A, of a series of upper air-shafts B, arranged to open at their lower ends into, or so as to communicate with said shaft, and terminating at their tops in side openings, or throats, D, substantially as specied.

2.` Ihe combination of the centre shaft A and outside or surrounding draught-case or shaft H, substan# tially as specified.'

3. The conical segmental deiiectors E, arranged around the group of air-shafts B, in combination with the centre shaft A, and outside shaft or draught-case H, essentially as shown and described.

4. The Hap-valves F, arranged and opegated as de scribed, in combination with the separate upper airshafts B and centre shaft A, substantially as herein set forth..

, A t B. J. BURNETT. Witnesses: t

J. W. Goonies, A. KINMER. 

